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Air Flow Table
WHITE LETTERING = SCFM BLACK LETTERING = Cv
CV to .20 CV to .30 CV to .70 CV to 1.2 CV to 2.0 CV to 3.6 CV to 5.7 CV to 10 CV to >10
CYLINDER BORE IN INCHES
IN./
SEC.		 1/4
 3/8
 1/2
 5/8
 3/4
 1
 1-1/2
 2
 2-1/2
 3-1/4
 4
 5
 6
 8
1 .0004 .009 .0009 .019 .002 .035 .003 .054 .004 .08 .007 .14 .015 .31 .026 .55 .042 .87 .07 1.46 .11 2.2 .17 3.5 .24 5.0 .43 8.9
2 .0008 .017 .002 .039 .003 .069 .005 .108 .008 .16 .013 .28 .030 .62 .053 1.1 .082 1.7 .14 2.9 .21 4.4 .33 6.9 .48 10.0 .85 17.7
3 .001 .026 .003 .058 .005 .104 .008 .162 .011 .23 .020 .42 .045 .94 .082 1.7 .125 2.6 .21 4.4 .32 6.7 .50 10.4 .72 15.0 1.3 26.6
4 .002 .035 .004 .078 .007 .14 .011 .22 .015 .31 .026 .55 .058 1.2 .106 2.2 .17 3.5 .28 5.9 .43 8.9 .67 13.9 .96 20.0 1.7 35.5
5 .002 .043 .005 .097 .008 .17 .013 .27 .019 .39 .033 .69 .077 1.6 .135 2.8 .21 4.3 .35 7.3 .53 11.1 .83 17.3 1.2 24.9 2.1 44.3
6 .003 .052 .006 .117 .010 .21 .016 .33 .022 .47 .040 .83 .091 1.9 .16 3.3 .25 5.2 .42 8.8 .64 13.3 1.0 20.8 1.4 29.9 2.6 53.2
7 .003 .061 .007 .136 .012 .24 .018 .38 .026 .55 .047 .97 .106 2.2 .19 3.9 .29 6.1 .49 10.2 .75 15.5 1.2 24.2 1.7 34.9 3.0 62.1
8 .003 .069 .008 .156 .013 .28 .021 .43 .030 .62 .053 1.1 .120 2.5 .21 4.4 .33 6.9 .56 11.7 .85 17.7 1.3 27.7 1.9 39.9 3.4 70.9
9 .004 .078 .009 .175 .015 .31 .024 .49 .034 .70 .058 1.2 .135 2.8 .24 5.0 .38 7.8 .63 13.2 .96 19.9 1.5 31.2 2.2 44.9 3.8 79.8
10 .004 .087 .009 .195 .017 .35 .026 .54 .038 .78 .067 1.4 .15 3.1 .26 5.5 .42 8.7 .70 14.6 1.1 22.2 1.7 34.6 2.4 49.9 4.3 88.7
11 .005 .095 .010 .214 .018 .38 .029 .60 .041 .86 .072 1.5 .16 3.4 .29 6.1 .46 9.5 .77 16.1 1.2 24.4 1.83 38.1 2.6 54.9 4.7 97.5
12 .005 .104 .011 .234 .020 .42 .031 .65 .045 .94 .082 1.7 .18 3.7 .32 6.6 .50 10.4 .85 17.6 1.3 26.6 2.0 41.6 2.9 59.8 5.1 107
13 .005 .113 .012 .253 .022 .45 .034 .70 .048 1.0 .087 1.8 .20 .41 .35 7.2 .54 11.3 .91 19.0 1.4 28.8 2.2 45.0 3.1 64.8 5.6 115
14 .006 .121 .013 .273 .024 .49 .037 .76 .053 1.1 .091 1.9 .21 4.4 .38 7.8 .58 12.1 .99 20.5 1.5 31.0 2.3 48.5 3.4 69.8 6.0 124
15 .006 .130 .014 .292 .025 .52 .039 .81 .058 1.2 .101 2.1 .23 4.7 .40 8.3 .63 13.0 1.1 21.9 1.6 33.2 2.5 52.0 3.6 74.8 6.4 133
16 .007 .139 .015 .312 .026 .55 .042 .87 .058 1.2 .106 2.2 .24 5.0 .43 8.9 .67 13.9 1.13 23.4 1.7 35.5 2.7 55.4 3.8 79.8 6.8 142
17 .007 .147 .016 .331 .028 .59 .044 .92 .063 1.3 .115 2.4 .25 5.3 .45 9.4 .71 14.7 1.2 24.9 1.8 37.7 2.8 58.9 4.1 84.8 7.3 151
18 .008 .156 .017 .351 .030 .62 .047 .97 .067 1.4 .120 2.5 .27 5.6 .48 10.0 .75 15.6 1.3 26.3 1.9 39.9 3.0 62.3 4.3 89.8 7.7 160
19 .008 .165 .018 .370 .032 .66 .050 1.0 .072 1.5 1.25 2.6 .28 5.9 .51 10.5 .79 16.5 1.3 27.8 2.0 42.1 3.2 65.8 4.6 94.8 8.1 169
20 .008 .173 .019 .390 .033 .69 .052 1.1 .077 1.6 .135 2.8 .30 6.2 .53 11.0 .83 17.3 1.4 29.3 2.1 44.3 3.3 69.3 4.8 100 8.5 178
22 .009 .191 .021 .429 .037 .76 .058 1.2 .082 1.7 .144 3.0 .33 6.9 .59 12.2 .92 19.1 1.6 32.2 2.3 48.8 3.7 76.2 5.3 110 9.4 195
24 .010 .208 .023 .468 .040 .83 .063 1.3 .091 1.9 .159 3.3 .36 7.5 .64 13.3 1.0 20.8 1.7 35.1 2.6 53.2 4.0 83.1 5.8 120 10.2 213
26 .011 .225 .024 .507 .043 .90 .067 1.4 .096 2.0 .173 3.6 .39 8.1 .69 14.4 1.1 22.5 1.8 38.0 2.7 57.6 4.3 90.1 6.2 130 11.1 231
28 .012 .242 .026 .545 .047 .97 .072 1.5 .106 2.2 .188 3.9 .42 8.7 .75 15.5 1.2 24.2 2.0 41.0 3.0 62.1 4.7 97.0 6.7 140 11.9 249
30 .013 .260 .028 .584 .050 1.04 .077 1.6 .111 2.3 .202 4.2 .45 9.4 .80 16.6 1.3 26.0 2.1 43.9 3.2 66.5 5.0 104 7.2 150 12.8 266
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